Motor



A9111 1927' v P. MARCHETTI MOTOR Fi1ed.Jan. 20, 1926 2 Sheets-Sheet 1 n r. m R M M llllflll'li-l (bum/ad I April 12 1927.

P. MARCHETTI MOTOR Filed Jan- 20, 1926 2 Sheets-Sheet 2 Q WRN Patented Apr. 12, 1927.

UNITED STATES PAUL MARGI-IETTI, OF SAN FRANCISCO, CALIFORNIA.

MOTOR.

Application filed January 20, 1926.

lhe general object of the invention is to provide means for eliminating the use of crank arms and their attendant bearings 1n the construction of reciprocating motors, and more particularly internal combustion motors.

A further object of the invention is the provision of a reciprocating internal combustion motor of the multi-cylinder type wherein the piston rods are arranged for op: erating cams carried by oppositely disposed shafts so that rotary movement is imparted to the shafts in the downward movement of the pistons.

The'above and other objects are accomplished by instrumentalities pointed out in the following specification.

The invention is clearly defined in the claims. I

A satisfactory embodiment of the invention is illustrated in the accompanying drawings forming part'of the specification and in which Figure 1 is a vertical cross section tal ten through a reciprocating internal combust on motor of the twin cylinder type and showing my invention applied thereto. I

Figure 2 is a 'ragnientary plan view of the lower portion of the oil casing of the motor shown in Figure 1, and showing the gear connection between the motor shafts. Figure 3 is a vertical longitudinal section taken through one end portion of an mternal combustion engine of the tandem cylinder type, and showing a modified form of my 1nvention applied thereto. t

Figure d is a vertical cross section oi: the motor shown in Figure 3, and looking at right angles to Figure 3, and v Figure 5 is a detail sectlon of the beam hanger taken on the line 55 of Figure 3. i In Figure 1, the cylinder block a is shown to include a pair of upright cylinders 5 and 6 which are respectively provided with water jackets 7 and openings 8 in the tops thereof for the reception of spark plugs. A horizontal web 9 connects the adjacent inner sides of the cylinders 5 and 6 and is disposed atthe base portions of the said cylinders as shown. The upper portion 10 of the casing depends from the cylinders 5 and 6, and the base of this portion 10 is provided with a peripheral flange 11 which is bolted to a similarly disposed flange 12 of the lower sec tion 13 of the case, the case being the usual and 30.

Serial No. $2,540.

structure provided for internal combustion engines for holding lubricant and affording bearings for the motor shafts, the bearings for the shafts being located as usual in the front and rear walls of the case. 7

In carrying out the present invention, I provide interiorly disposed upright webs within the engine case. Que of these webs is shown in Figure 1 and indicated by 14. For convenience in manufacture, the web 14 may be formed with the lower portion 13 of the case, and disposed in vertical alinement with the cylinders 5 and 6 located above. The structure about to be described may be regarded as being provided for each pair of cylinders of a motor when such cylinders are arranged as shown by 5 and 6 in Figure 1. The intermediate lower side portion of the web 14 is cut away to provide a passage 16 for the free flow of lubricant through the lower portion 13 of the case. The intermediate portion of the upper side of the web 14 is extended vertically upward as at 17, and a bearing is provided therein for a pin 18 at the central portion of a beam 19, the opposite outer ends of which are loosely connected to pins 20 which extend transversely through the lower ends of piston rods 21. and 22. 23 and 24 indicate rollers disposed upon the pins 20 and located to one side of the outer ends of beam 19. When the piston rods 21 and 22 are forced downwardly by the pistons 25 and 26, the rollers 23 and 24 operate upon cams 27 and 28 which are rigidly secured to the engine shafts 29 spending size and shape, each cam being oblong as shown with rounded end edges and inwardly curved oppositesides. The cams are arranged so as to extend one at right angles to the other, so that when the cam on the right of Figure 1, for instance, extends upright or vertical, the cam on the left in the said figure will be disposed in the hori- The cams 27 and 28 are of come i carried by the case, and the shafts 29 and 30 also have additional bearings in the web 14, as shown in Figures 1 and 2.

In the operation of the parts thus'far-described, it is to be. noted that. the. pistony is at the end of its in or up stroke at the time that the piston 26 is at the end of its= down or out stroke. In this connection it is to be observed that'when a charge of fuel is exploded in one of the cylinders and forces the piston thereof outwardly, the piston in the opposite cylinder moves inwardly operati'n'g either to compress a charge therein or expel the products of'a previously exploded charge therefrom. It may be assumed that with theparts positioned as shown inFigure l, the;piston 25' is at the end of. its compression stroke, and the piston26 atthe end of'itsint'ake stroke, so that when the com.- pressedchargeis ignitedin the cylinder 5 and-the piston 25 moves downwardly, downwardmovement 0f the piston rod 22operates to turn the cam 27 in the directionof'the arnow. The roller 23 turns upon the face of the cam.2 7fin the downward. movement of the rod 22 and intheturningflof the can'r27, and thesametiinethe beam 19 rocks and operatesto movethe piston rod. 21. and the piston -26'upwardly and to. compress a charge of fuel'within the cylinder 6. The turning of-the'cam 2'1 turns, the'shaft 29, and motion is transmitted by the gear wheelsBl. and 32 totheshaft 30, and likewise to the cam 28 so. that thecam 28 operates to assist the beam 19 in moving the rod 21 and the piston 26 upwardly. Atthe time thatthe compressed charge in cylinder 6. is ignited,.the pistons 25" and 26., together with'the cams 27'and28, occupy positions. the reverse of thoseshown in Eigure lofthe drawings.

In the modifiedform shown in Figures '3) to 5', inclusive, the engine drive-shaft 36 extends through Ia casing... 37 of' a motor wherein the cylinders 38and'39 are disposed in tandem relation. The rods 40 and-41' of the. pistons 42 are provided with oblong openings 43'. for the reception of the engine shaft'36, andare. additionally provided with. slots 44 disposed at right angles to the openings .43 and adapted for permitting rotation of cams 45 and 46-rigidly secured to the shaft 36; The cams 45 and 45 are oblong,- with their central portions secured 5I'located1belowthe engine shaft 36.

to shaft 36; their ends being rounded as indicated at 47. Two inwardly curved portions 48 and 49 are provided at each side of. each of the cams, and the cams are so disposed that their ends and curved side portions bear upon rollers 50 which are secured in the upper or inner ends of the slots 44. all of which is shown in Figures 8 and 4. The case 37 is providedi'wit-h a-horizontally disposed guide The lower end portions of the piston, rods 40 and The guide also provides a support for an adjustable hanger which consists of a third shaft 52 disposed within a sleeve depending from the guide 51, with one end of the shaft.extendingupwardly through the guide and screw threaded as at 54 with an adjusting nut 55 screwed thereon and operating to adjust the hanger vertically and secure the. same within the sleeve 53. The lower end ofv the shaft 52 terminates in a yoke which has a transversely"disposed pivot 56 to which is connected the central portion ofa beam 57, the opposite ends of which are connected by links 58 to the lower ends of the piston rods 40 and 41. The cams 45 and 46 are arranged so that one extends at right angles to theother, as shown in Figures 3 and 4, and in respect to this disposition of the cams 45 and 46 and the connection between the piston rods, the operation. of'the partscorresponds to that described in connection with the parts shown in Figure 1..

From the foregoing it is to be observed that the device of the present invention operates toimpart rotary motion to the drive shaft of machinery without the use of cranks, and it is further adapted to operate more evenly and with better balance than can be had by the employment of the usual crank shaft. The straight line movements of the piston rods during their power strokes operate to develop greater power than can be had by the use of oscillating piston rods which go to provide the present form of connection between pistons and crank shafts. The provision of the. present construction eliminates the use. of costly crank rod'bearings and the expense incident to the replace.-

ment of thesejafter they have become worn in use.

Although Ihave shown and described one embodiment of my invention, it is torbe understood that the same is susceptible of various changes; and I reserve the right to employ such as may come within the scope of the appended claims.

I claim:

1. A motor having-a plurality of cylinders; arranged in parallel rows, each of said cylinders having. a piston and a piston rod, a plurality. of engine shafts arran ed in parallel relation and connected together at one end, oblong cam members secured to said engine shafts and arranged'so as to extend one at an angle to the other and dis posed so as to bear constantly upon. the free ends of said piston rods, a beam member pivotally supported between the said cylinders of they motor and having its op posite ends pivotally connected to the end portions of said piston rods.

2. A motor having a plurality of-cylinders arranged in parallel rows, each of said cylinders having a piston and a piston rod,

41 are adapted to slide within the guide 51. a plurality of engine shafts arranged in parallel relation, a propeller shaft disposed parallel with and between the engine shafts oblong cam members secured to said engine shafts and arranged so as to extend one at an angle to the other and disposed so as to bear on the free ends of the piston rods, a beam member pivotally supported between the said cylinders and having its opposite ends pivotally connected to the end portions of the piston rods, and a gearing connection between said engine shafts and the propeller shaft.

3. In a motor provided with a drive shaft, paired cylinders arranged with their axes in a plane and having a single piston in each cylinder and a piston rod pivotally connected at one end with the piston; a beam member pivotally mounted between the paired cylinders and pivotally connecting the other ends of the respective piston rods; and a pair of cam members arranged for the paired cylinders so as to bear constantly upon the beam-connected ends of the respective piston rods, each cam member being mounted in axial alignment with the respective cylinder and having driving connection with the drive shaft.

PAUL MABGHETTI. 

